Fundamentals of Geotechnical Engineering and …mucc.mahidol.ac.th/~pongpipat.ana/2015 EGAT...
Transcript of Fundamentals of Geotechnical Engineering and …mucc.mahidol.ac.th/~pongpipat.ana/2015 EGAT...
Fundamentals of Geotechnical Engineering and
Laboratory Data Analysis
21-25 December 2015
Department of Civil and Environmental Engineering
Faculty of Engineering, Mahidol University
Dr. Pongpipat Anantanasakul
Origin of Soils and Grain Size
What is a soil?
Rock cycle
Rock mineralogy
Weathering of rock into soil
• Chemical weathering
• Mechanical weathering
o Temperature
o Moving water
o Glaciers
o Wind
Different soil types categorized by modes of transportation
Examples:
• Laterite soil is residual soil.
• Bangkok clay is marine soil .
• Khon Kaen loess is eolian soil.
• Ayutthaya sand is alluvial soil.
Weathering processes
Temperature: expansion, contraction Chemical
1908 1969
Wind Wave and current
Living beings: plants Living beings: humans
Weathering processes
Weathering is a process of degradation, decomposition of rock mass which results
into smaller rock (mineral) particles.
Glacier Volcanic activities
Soil-particle size
Clay minerals
Clay minerals
Clay minerals
Specific gravity
Sieve analysis
Hydrometer analysis
Particle-size distribution curve
Particle-size distribution curve
Coefficient of gradation
Uniformity coefficient
Particle-size distribution curve